Try using Wings3d's UV unwrapping tools and then reconsider your allegiance to UU3D -- Wings3D is both more powerful and easier to use than UU3D.
Is this a joke? I use Wings3D for my modelling and love it; however, it's unwrapping capabilities are nowhere near as good as UU3D. Are you insane?!
[edit] Sorry, that was a little strong. I was a wee bit drunk when I wrote that. :P